IDEA下Servlet访问404问题解决

@WebServlet(name = "/userListServlet")
public class UserListServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {


        //1.调用UserService完成查询
        UserService service = new UserServiceImpl();
        List<User> users = service.findAll();
        //2.将list存入request域
        request.setAttribute("users",users);
        //3.转发到list.jsp
        request.getRequestDispatcher("/list.jsp").forward(request,response);
     ;
    }

图上 web 访问一直报404无法访问

解决办法，

@WebServlet(name = "/userListServlet",urlPatterns = "/userListServlet")

添加：urlPatterns = "/userListServlet"

@WebServlet(name = "/userListServlet",urlPatterns = "/userListServlet")
public class UserListServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //1.调用UserService完成查询
        UserService service = new UserServiceImpl();
        List<User> users = service.findAll();
        //2.将list存入request域
        request.setAttribute("users",users);
        //3.转发到list.jsp
        request.getRequestDispatcher("/list.jsp").forward(request,response);
     ;
    }